The purpose of this study was to evaluate canal shaping ability and canal angulation change of K-file, straight endosonic K-file and precurved endosonic K-file.
Twenty straight canals and thirty curved canals were selected and divided into five groups according to canal curvature and canal instrumentation method. U1 group was prepared by straight endosonic K-file and H1 group by H1 group by K-file in
straight
canals. U2 group was instrumented by straight endosonic K-file, U3 group by precurved enosonic K-file and H2 group by precurved K-file in curved canals.
Radiographs of canals were obtained before and after canal shaping. And postoperative radiographs were compared with preoperative radiographs using superimposition method.
@ES The results obtained were as follows:
@EN 1. In straight canals, K-file group demonstrated larger percentage of canal enlargement than endosonic K-file group on facial view.
2. In curved canals, precurved K-file group showed largest percentage of canal enlargement, followed by precurved endosonic K-file group and straight endosonic K-file group.
3. Percentage of canal enlargement at convex side was greater than at concave side in apical portion of each group. especially in straight endosonic K-file group, percentage of canal enlargement at the convex side and concave side showed
significant
difference.
4. In canal augulation change, the straight endosonic K-file group exhibited the greatest change followed by precurved endosonic K-file group and percurved K-file group.
5. Above results suggest that K-file is more effective endodontic instrument than endosonic K-file, and that precurved K-file is effective for canal shaping in curved canal.
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